Abstract
The Low Voltage Direct Current (LVDC) system concept has been growing in the recent times due to its characteristics and advantages like renewable energy source compatibility, more straightforward integration with storage utilities through power electronic converters, and distributed loads. This paper presents the energy efficiency performances of a proposed LVDC supply concept and other classical PV chains architectures. A PV source was considered in the studied nanogrids. The notion of relative saved energy (RSE) was introduced to compare the studied PV systems energy performances. The obtained results revealed that the use of the proposed LVDC chain supply concept increases the nanogrid efficiency. The installed PV power source in the building should be well sized regarding the consumed power in order to register a high system RSE. The efficiency of the new LVDC architecture is 10% higher than the conventional LVDC one.
Highlights
E main objective of this paper is to investigate the energy efficiency performance of a proposed Low Voltage Direct Current (LVDC) PV system regarding a classical LVDC architecture and classical PV systems using AC loads
Lasseter proposed the concept of the DC Microgrid as a low voltage distribution network. is concept was projected as the future low voltage distribution systems which were facing revolutionary variations at the time due to emanation of distributed generation and market liberalization. e basic idea behind this concept is to combine micro sources and loads into one entity which could be interpreted as a single dispatchable load that could respond in short time to meet the transmission system needs [6]
E paper is organized as follows: In the first part, we focused our study on the state of the art related to the use of the LVDC supply concept and the proposition of an on-grid LVDC PV chain. e disadvantages of the use of classical on-grid PV systems and of using AC plugs to supply electric DC loads are shown. e used average model of power converters is presented. is model allows the evaluation of the different converters efficiencies in the studied PV chains. e last part of the paper treats the energy efficiency performances of the proposed LVDC system compared to others classical ones
Summary
Electronic appliances, such as computers, gaming consoles, printers, economic or LED lights, televisions, and so on, need DC supplies. E DC/AC converter, Converter #2, transfers the PV generated power to the grid and ensures the regulation of the DC voltage value (400 V) of the inverter input. Circuit oriented simulations on Saber tool (from Synopsys) allowed generating the evolutions of different converters efficiencies as a function of transferred power. We present the proposed new PV architecture for DC loads supplies and the developed average model of power converters. E last converter allows the transfer of power from PV panels to the inverter when the generated power is higher than the consumed power. Pc0 DC load supplies (12 V, 24 V, 48 V...) Figure 2: Possible LVDC classical architecture (syst2)
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